/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Unload a streamed in level (by Name)
static void UnloadStreamLevel ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, [FName](API\Runtime\Core\UObject\FName) LevelName, [FLatentActionInfo](API\Runtime\Engine\Engine\FLatentActionInfo) LatentInfo, bool bShouldBlockOnUnload )